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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30fa5207314431356e37e20d60dd07782c36bcd629d46d11927df9296a5ed79' 
  AND token = 'ab7OurpjIa4jRmKZWIOngpc5nxZp9CPqpqCiAUt22Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}